Maybe, after installing DD-WRT on your Linksys WRT1900ACS router you realise that it is not for you or maybe you want to try a different router firmware such as OpenWrt or Tomato, so you want to restore the original Linksys firmware on your router. Here’s how you can do it.
Step 1: Download everything you need
This is kind of obvious, but important. You should download all firmware files needed in this process before you start because you won’t have Internet access during part of the process.
DD-WRT to factory firmware
Download the regression firmware for your router from https://source.wifihell.com/3-DD-WRT-KONG/K3-AC-MVEBU/LinksysFW/, in my case WRT1900ACS_ddwrt-to-factory.img.bin
Download the latest firmware for your router from Linksys website. Remember to choose the right firmware for your router version. The hardware version is located beside or beneath the model number and is labeled version, ver. or V. If there is no version number beside the model number on your Linksys product, the device is version 1. If you still have trouble finding your version number, see the complete article at Linksys Official Support site to learn more.
Step 2: Flash from DD-WRT to the factory firmware
Now connect your computer to the router using an ethernet cable and log in to your DD-WRT admin page (http://192.168.1.1). Then navigate to ‘Administration > Firmware Upgrade‘ and select the DD-WRT to factory firmware file we downloaded earlier (‘
WRT1900ACS_ddwrt-to-factory.img.bin‘) and click on the ‘Upgrade‘ button.
Wait for the router to flash the firmware and reboot itself.
Step 3: Update Linksys firmware
Disconnect the Internet cable
Before updating the Linksys firmware I like to disconnect the router from the Internet to avoid some problems I had in the past.
Update Router Firmware
Enter the Linksys admin page (http://192.168.1.1) with the default admin password (‘
Navigate to the Connectivity section and locate the Router Firmware Update section on the right hand side.
Click on the Choose File button in the Manual section, select the firmware image that you downloaded from the linksys site earlier (‘
FW_WRT1900ACS_126.96.36.199766_prod.img‘) and then hit Start.
Wait until the firmware installation is complete.
With your router connecter to power and turned on, press and hold the Reset button on the back of your router for 10 seconds until the power indicator flashes.
Wait a couple of minutes until the power indicator stops flashing to start the ‘Linksys Smart Wi-Fi Setup‘ (http://192.168.1.1) and then click on ‘Manual configuration‘ to start the configuration of your Linksys WRT1900ACS Router with the latest stock firmware.